Gakuen 2: Ingyaku no Zushiki

Due to a school conspiracy, Tetsuya is forced to drop out of school. In order to satisfy his need for revenge, Tetsuya needs to get his hands on Haruna, the principal's daughter. However, to do that, he needs another to girl to lure Haruna out. That's where Ayano comes in...
(Source: AniDB)